Libav
mjpegdec.h
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1 /*
2  * MJPEG decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
29 #ifndef AVCODEC_MJPEGDEC_H
30 #define AVCODEC_MJPEGDEC_H
31 
32 #include "libavutil/log.h"
33 #include "libavutil/pixdesc.h"
34 
35 #include "avcodec.h"
36 #include "blockdsp.h"
37 #include "get_bits.h"
38 #include "hpeldsp.h"
39 #include "idctdsp.h"
40 
41 #define MAX_COMPONENTS 4
42 
43 typedef struct MJpegDecodeContext {
44  AVClass *class;
47 
48  int start_code; /* current start code */
51 
52  int16_t quant_matrixes[4][64];
53  VLC vlcs[3][4];
54  int qscale[4];
55 
56  int org_height; /* size given at codec init */
57  int first_picture; /* true if decoding first picture */
58  int interlaced; /* true if interlaced */
59  int bottom_field; /* true if bottom field */
60  int lossless;
61  int ls;
63  int rgb;
64  int rct; /* standard rct */
65  int pegasus_rct; /* pegasus reversible colorspace transform */
66  int bits; /* bits per component */
67 
68  int maxval;
69  int near;
70  int t1,t2,t3;
71  int reset;
72 
73  int width, height;
78  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
86  int h_max, v_max; /* maximum h and v counts */
87  int quant_index[4]; /* quant table index for each component */
88  int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
89  AVFrame *picture; /* picture structure */
90  AVFrame *picture_ptr; /* pointer to picture structure */
93  int8_t *qscale_table;
94  DECLARE_ALIGNED(16, int16_t, block)[64];
95  int16_t (*blocks[MAX_COMPONENTS])[64];
102 
105 
109 
111 
112  int cur_scan; /* current scan, used by JPEG-LS */
113  int flipped; /* true if picture is flipped */
114 
115  uint16_t (*ljpeg_buffer)[4];
116  unsigned int ljpeg_buffer_size;
117 
119 
122 
126  void *data, int *got_frame,
127  AVPacket *avpkt);
132  const uint8_t *mb_bitmask, const AVFrame *reference);
134  const uint8_t **buf_ptr, const uint8_t *buf_end,
135  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
136 
137 #endif /* AVCODEC_MJPEGDEC_H */
int block_stride[MAX_COMPONENTS]
Definition: mjpegdec.h:76
const AVPixFmtDescriptor * pix_desc
Definition: mjpegdec.h:120
int v_count[MAX_COMPONENTS]
Definition: mjpegdec.h:79
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int h_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:84
BlockDSPContext bdsp
Definition: mjpegdec.h:99
Scantable.
Definition: idctdsp.h:29
int qscale[4]
quantizer scale calculated from quant_matrixes
Definition: mjpegdec.h:54
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
uint8_t * buffer
Definition: mjpegdec.h:50
int dc_index[MAX_COMPONENTS]
Definition: mjpegdec.h:81
int linesize[MAX_COMPONENTS]
linesize << interlaced
Definition: mjpegdec.h:92
int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:85
int comp_index[MAX_COMPONENTS]
Definition: mjpegdec.h:80
HpelDSPContext hdsp
Definition: mjpegdec.h:100
int16_t block[64]
Definition: mjpegdec.h:94
uint8_t
uint16_t(* ljpeg_buffer)[4]
Definition: mjpegdec.h:115
unsigned int ljpeg_buffer_size
Definition: mjpegdec.h:116
int16_t quant_matrixes[4][64]
Definition: mjpegdec.h:52
uint8_t * last_nnz[MAX_COMPONENTS]
Definition: mjpegdec.h:96
AVFrame * picture_ptr
Definition: mjpegdec.h:90
const char data[16]
Definition: mxf.c:70
#define MAX_COMPONENTS
Definition: mjpegdec.h:41
int h_count[MAX_COMPONENTS]
Definition: mjpegdec.h:78
bitstream reader API header.
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mjpegdec.c:1467
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
Definition: mjpegdec.c:134
int ff_mjpeg_find_marker(MJpegDecodeContext *s, const uint8_t **buf_ptr, const uint8_t *buf_end, const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
Definition: mjpegdec.c:1379
int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask, const AVFrame *reference)
Definition: mjpegdec.c:1016
int nb_blocks[MAX_COMPONENTS]
Definition: mjpegdec.h:83
VLC vlcs[3][4]
Definition: mjpegdec.h:53
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
Definition: mjpegdec.c:221
Definition: get_bits.h:64
ScanTable scantable
Definition: mjpegdec.h:98
Half-pel DSP context.
Definition: hpeldsp.h:45
int near
near lossless bound (si 0 for lossless)
Definition: mjpegdec.h:69
int component_id[MAX_COMPONENTS]
Definition: mjpegdec.h:77
int quant_index[4]
Definition: mjpegdec.h:87
int v_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:85
GetBitContext gb
Definition: mjpegdec.h:46
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
Definition: mjpegdec.c:167
IDCTDSPContext idsp
Definition: mjpegdec.h:101
Half-pel DSP functions.
Libavcodec external API header.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
main external API structure.
Definition: avcodec.h:1050
int8_t * qscale_table
Definition: mjpegdec.h:93
Describe the class of an AVClass context structure.
Definition: log.h:33
int ac_index[MAX_COMPONENTS]
Definition: mjpegdec.h:82
int reset
context halfing intervall ?rename
Definition: mjpegdec.h:71
uint64_t coefs_finished[MAX_COMPONENTS]
bitmask of which coefs have been completely decoded (progressive mode)
Definition: mjpegdec.h:97
AVCodecContext * avctx
Definition: mjpegdec.h:45
int got_picture
we found a SOF and picture is valid, too.
Definition: mjpegdec.h:91
int16_t(*[MAX_COMPONENTS] blocks)[64]
intermediate sums (progressive mode)
Definition: mjpegdec.h:95
AVFrame * picture
Definition: mjpegdec.h:89
int last_dc[MAX_COMPONENTS]
Definition: mjpegdec.h:88
int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:1666
This structure stores compressed data.
Definition: avcodec.h:950